When the car temperature light comes ON or starts to flash . And Coolant Level Light Troubleshooting

[@Dilloln]

How old are you?

[@amethysttadpole]

Is flashing vs solid meaning true for all vehicles? We have a Prius v and it recently flashes every once in a while for 5 seconds or less and then goes back off. Usually after we’ve been driving for over 30min. Coolant level is fine, no leaks that we can see. It started doing it after we took it in to get the brakes checked, could be coincidence but I wonder if a sensor got jostled.